Heat-resisting steel



Patented Nov, 24, 1925.

UNITED STATES PATENT OFFICE.

HEAT-RESISTING STEEL.

Ito Drawing.

To all whom it may concern."

Be it known-that I, EDWARD H. NoAoK,

a citizen of the United States, residing at Stockton, county of SanJoaquin, State of California, have invented'certain new and useful Improvements in Heat-Resisting Steel; and I do declare the following to be a full, clear, and exact description of the same. t 4

This invention relates to the metallurgical art, and particularly to steel making; my principal object being to produce asteel of a heat resisting nature, suitable for any purpose where the metal is subjected to high temperatures when in service. This steel is especially adapted for making gratebars; fire-door liners, arches and bearing bars; case hardening carbonizing pots; gas engine valves; oil valves, and in fact any place where the conditions of operation require a heat resisting metal.

The improved steel contains, besides the main body of iron, silicon, manganese, carbon, sulphur, phosphorus, and copper, These alloying elements are combined in the following proportions in the product Silicon, 1.50 to 2.00%; copper, 0.50 to 1.00%; manganese, 0.12% and under; carbon, 0.10% and under; sulphur, 06% and under; phosphorus, 06% and under.

It will be noted from the above formula that the silicon and copper content isvery high compared to the other elements, particularly with regard to the manganese and carbon. The high silicon and copper con tent, and the low manganese and carbon content, are the factors which together control the heat resisting properties of the steel.

The high content of the two first named elements is necessary to impart the desired heat resisting qualities to the steel, while finished Application filed June 14, 1924 Serial No. 720,122.

a low manganese and carbon content is also necessary in obtaining this result.

In other words steel with a high silicon and copper content, with an equally high manganese and carbon content, would not have the desired properties, and neither would a steel having a low manganese and carbon content and a proportionately low silicon and copper content.

In practice, 1 preferably prepare the special steel from ordinary scrap steel, which usually contains all the above elements except copper. An analysis of such steel usually discloses however that silicon is not present insufficient quantity, while there is too much manganese and carbon.

The particular phosphorus and sulphur content is not especially vital to my prodnot, and do not interfere with the heat resisting properties to-be obtained. The proportions of these elements is usually such that they may be left undisturbed.

The manganese and carbon content is therefore reduced to the desired amount, by methods well known to the steel maker, and the requisite amount of silicon and copper added. The exact proportion of manganese may be varied somewhat according to the 76 strength desired in the final product,

Th1s metal, with the exception that the copper is omitted, is also highly suitable for lead pots and cyanide hardening pots.

Having thus described my invention to what I claim as new and useful and desire to secure by Letters Patent is:

A steel containing silicon between 1.50% and approximately 2.00%; copper between 0.50% and approximatel 1.00%; manganese not over 0.12% an "carbon not over 0.10%.

In testimony whereof I aflix my signature.

EDWARD. HENRY NOACK; 

